Premium
Rainbow fringes around crevice corrosion formed on stainless steel AISI 316 after ennoblement in seawater
Author(s) -
Wang W.,
Zhang X.,
Wang J.
Publication year - 2009
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200805200
Subject(s) - crevice corrosion , seawater , metallurgy , materials science , corrosion , geology , oceanography
The crevice corrosion occurrence probability of stainless steel (SS) AISI 316 was increased under ennoblement condition due to chemically added H 2 O 2 into seawater. The H 2 O 2 was used to simulate the important factor causing ennoblement in natural marine biofilm. Morphology of the crevice corrosion was observed using an incident‐light source microscopy. Some interesting “rainbow” fringes were observed around micro‐crevices. The mechanism was discussed from the ions diffusion and potential distribution during the crevice formation. This result shows that under ennoblement condition the colored fringe is a distinct characteristic of the morphology of localized corrosion for stainless steel.